Q. Which of the following includes both microscopic plants like algae and animals like crustaceans and protozoans found in all aquatic ecosystems, except certain swift moving waters?
Answer: Plankton
Notes: Plankton includes both microscopic plants like algae (phytoplankton) and animals like crustaceans and protozoans
(zooplankton). They are found in all aquatic ecosystems, except in certain swift moving waters.

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